Have you thought about getting slipcovers made? If you wanted to go with a cottage look white or off white would look good with your rustic fireplace. Don't be afraid of the white, slipcovers that are made well will last a long time, and can be washed even bleached. I have had mine for probably 9 years now. Love that you can wash them. I would skirt the bottom of the slipcovers. I think it would really transform them. You could bring in some blue accents with pillows, etc. Some pictures on your wall with some ocean blues would look nice with some rustic touches like antlers, shells etc.

Mine are 5 years old, get cleaned once a year and still look good. They do age into a mellow white which I can live with.

Congratulations on your new home! Now, go cancel that order! Just kidding. Kind of... I really do think, after reading your posts, that you will be happier with the grey couches. Personally, black couches in general seem very bachelor pad (ish). That said, I know there are gorgeous black leather couches available. For a super modern industrial place, maybe. But beach, or that kind of vibe? I am not sure how you would pull that off over the years. Grey or tan (neither are my own favorite decorating colors, but still) would be oh so much better as a neutral for pulling in different color palettes with pillows and art, etc. if you decide to change up through the years... black might make you feel stuck. After reading through what I have written it seems a bit funny, as black is my personal neutral in clothing, jewelry and the like. But as I look around my home there is no black to be seen. Hmmm. In any event, follow your own intuition here, and don't feel like you have to fill the space before your home is even completed. Especially if you are having second thoughts. And remember, this is supposed to be fun for you! When in doubt, leave it out! At least for the time being.

Personally I wouldn't hang black curtains with this colour lounge suite. I would also take out everything that you don't need in the room as it is too cluttered. I actually like the wood as it matches like Bernadette said. I see that you are adding pops of red in the room. How about a picture on the wall with that colour in it, as the walls are quite bare. Are you able to remove the computer desk and chair? I love big mirrors in a lounge room too . . . The programs that I have watched in NZ, ask 'what is the hero in the room?' So I think you need to ask yourself this and work with that, going forward. . . . The only comment I can make on the skateboard is I think it is placed too high on the wall.